DID is an OEM of many Japanese and European brands. Leading racing teams in the Road and off-road sports rely on the technology of DID. DID 530VX: The development of the 530VX is based on the long - term experience of DID in the MotoGP and fulfills the highest demands through the use of the patented X-rings. Compared to the O-ring equipped V-series, the 530VX has a higher strength and a higher wear resistance. - high durability and low friction due to patented X-ring black outer pockets, black inner pockets